Its not even just the industrial waste and litter in Delhi though, the city is streaked with red spit from Paan(betel nut) chewers. It is everywhere, its disgusting. Then there is also the fact that around half the population don't have access to a bathroom on the subcontinent, so people urinate and defecate outside everywhere. You are never not far from bodily fluids in Delhi. More people have access to cell phone than bathrooms in India. All this aside though it is truly an amazing and fascinating place to visit. It's unlike anywhere else.